package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.Follow;
import com.hmdp.entity.User;
import com.hmdp.mapper.FollowMapper;
import com.hmdp.service.IFollowService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.service.IUserService;
import com.hmdp.utils.UserHolder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.util.Collections;
import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;
import java.util.stream.Stream;

/**
 * <p>
 *  服务实现类
 * </p>
 *
 * @author 钟乐
 * @since 2021-12-22
 */
@Service
public class FollowServiceImpl extends ServiceImpl<FollowMapper, Follow> implements IFollowService {

    @Autowired
    StringRedisTemplate stringRedisTemplate;

    @Override
    public Result follow(Long id, Boolean isFollow) {

        //获取当前用户
        Long userId = UserHolder.getUser().getId();
        String key = "follows:" + userId;


        //1、是关注还是取关
        if(isFollow){
            //关注
            Follow follow = new Follow();
            follow.setUserId(userId);
            follow.setFollowUserId(id);
            boolean isSuccess = save(follow);
            if (isSuccess) {
                //关注的用户id放入redis
                //将当前用户的关注用户加入redis，set="follows:" + userId; value = follow_user_id
                stringRedisTemplate.opsForSet().add(key,id.toString());
            }
        }else{
            //取关
            boolean isSuccess = remove(new QueryWrapper<Follow>()
                    .eq("user_id", userId)
                    .eq("follow_user_id", id));

            if(isSuccess){
                stringRedisTemplate.opsForSet().remove(key,id.toString());
            }
        }

        return Result.ok();
    }

    @Override
    public Result isFollow(Long id) {

        Long userId = UserHolder.getUser().getId();

        ////查询是否关注
        System.out.println(userId+""+id);

        Integer count = query().eq("user_id", userId).eq("follow_user_id",id).count();

        System.out.println(count);

        return Result.ok(count>0);
    }


    @Resource
    IUserService userService;
    @Override
    public Result followCommons(Long id) {

        Long userId = UserHolder.getUser().getId();

        String key = "follows:" + userId;
        String key2 = "follows:" + id;

        Set<String> intersect = stringRedisTemplate.opsForSet().intersect(key, key2);


        if(intersect==null || intersect.isEmpty()){
            return Result.ok(Collections.emptyList());
        }

        //转为long
        List<Long> ids = intersect.stream().map(Long::valueOf).collect(Collectors.toList());

        //查询用户
        List<UserDTO> dtoList = userService.listByIds(ids).stream()
                .map(user -> BeanUtil.copyProperties(user, UserDTO.class))
                .collect(Collectors.toList());

        return Result.ok(dtoList);
    }


}
